docs: def addVSLCtoParent(self, vslc_id, parent_id):
          """
          The VSLC can either be added to a genotype or to a GVC.
          The vslc is added as a part of the parent.
          :param vslc_id:
          :param parent_id:
          :return:
          """
  
          self.addParts(vslc_id, parent_id, self.globaltt['has_variant_part'])
  
          return